Internal combustion engine



June 9, 1931.l K: ELTZE 1,809,477 I INTERNAL coMBUsTIoN ENGINE Filed Jan. 12, 1928 Patented June 9, 1931 srarss,

KURT ELTZE, F MANNHEIM-KAFERTAL, GEB-MANY, ASSGNOR TO DAIMLER-BENZ .AK-V

TIENGESELLSCHAFT, OF STUTTGART-UNTERTURKHEM, GERMANY, A COMPANY OF GERMANY Application filed January 12,1928, Serial Nore, and in Germany January 19, 1927.

This invention relates to improvements in and connected with internal combustion engines and more particularly to engines of the kind in which tappet mechanism is employed for operating the valves.

The object of the invention is to provide a simplified construction and arr ngement adapted for enabling the cam shaft, cam shaft bearings and housing, and the tappet guides to be readily removed in a very convenient manner.

According to this invention, the cam shaft bearings. and the tappet guides associated therewith are removably mounted upon the engine body either as a` combined unit or as separate units. ln carrying out the invention, it is advantageous to provide means displa'ceable axially of the camshaft fo-r the mounting or dismounting of the valve gear,

and it is of further advantage to adapt these means so that they are capable of adjustment, for the purpose of enabling the cam` shaft to be adjusted with accuracy for attaining correctness of mesh of its driving gear.

In carrying out the invention, the camy shaft housing supports are provided by bearings for the cam shaft, which bearings are mounted in the end Walls of the engine body;

more particularly in the case of cylinder block engines.

These improvements simplify the construction of a block of cylinders and 'facilitate the production thereof as Well as the production and tting of 'the cam shaft housing.

In order to enable the invention to be readily understood reference is made to the accompanying drawings illustrating one ex-` ample of a practical construction Vembodyingl these improvements, in which drawings Figure l is a side elevation of an engine with the removable valve gearing, parts of the cam .shaft housing and bearings shown in section.

Figure- 2 is an end elevation of Figure 1,

but with parts of the engine body broken away and the cam shaft housing in section. Figure 2 also shows overhead parts of the Valve gear which are omitted from Figure` 1.

Figure 3 is a sectional end elevation of eco centric supporting means for the cam shaft.

In the example illustrated in the drawings, the engine comprises a cylinder block or monoblock Which is indicated by the reference letter e. In one side of the cylinder block there is removably attached the cam shaft housing b and the latter supports guides for the tappets, which operate the valves. rllhe housing ZJ is carried by the ends of bearing sleeves c and d which engage into the housing as supporting centres, as shown. The sleeves c and (Z provide bearings for the cam shaft disposed Within the housing and they are inserted into holes drilledor bored in the end Walls of the cylinder block a, the said sleeves being formed with end flanges or heads which come against the exterior of 7 the said end Walls when lthe sleeves are inserted from-the exterior so that their inner ends engage into the ends of the lhousing bI which is disposed Within cavity in the cylinder.i block. Further bearings for the cam shaft lare mounted inside the housing Z), as shown -lar guide 'parts being connected together by Webs. The latter are formed With suitable bosses, Where required, and bolts g passed through these bosses into the engine block, as seen in Figure 2, serve for fiXedly mounting the housing and ta-ppety guides Within the cavity above referred to. This cavity maybe closed by a cover plate f, also as seenin Figure 2. f 1 y Y The length of the housing b is such that, after endvvise Withdrawal of the bearing sleeves c, from their holes in the cylinder block and the' consequent disengagement of such sleeves from the housing, the latter can be removed from the engine block if desired, 'together with the cam shaft, the removal of the latter with the housing-'being Lpossible after removal of the gear Wheel e `from such shaft and by an endWise Withdrawal in an inclined positionV of such shaft.

It is possible to arrangerthe bearing sleeves c and Z so that there is an eccentrieity ofthe shaft axis in relation to the holes in which the sleeves are mounted, as shown in Figure By rota-tively adjusting the sleeves within the said holes it is possible to adjust to a nicety the distance vof the cam shaft axis from the crank shaft axis and thereby oompensate for eonstructional inaceuracies which might otherwise adversely affect the meshing of the toothed gear e with another 'gear on the Vcrank shaft.

What l Claim is :d l Y l. An internal combustion engine eomprising tappet valvev gear including a cam shaft, a housing enclosing the Clam shaft, Cam shaft bearings inside the housingV and tappet guides on the housing, the said housing, bearings, and tappet guides being removable from the engine as a unit, and endwise removable supports for ,the housing, the said supports being capable of being moved aX- ially in relation to the Cam shaft to allow the valve gear to be mounted upon and removed from the engine.

2. An internal e combustion engine with tappetvalve gear having a cam shaft, a cam shaft housing, cam shaft bearings and tappet guides associated with the housing, the said cam shaft bearings consisting of sleeves acting as supports for the Camshaft housing, apertures in the end Walls of the body of the engine to allow the said sleeves to be inserted endwise for engagement with the cam shaft housing, further cam shaft bearings inside the housing, the said cam shaft bearings inside the, housing and tappet guides being both mounted in a removable manner on the engine, as set forth.

3, An internal combustion engine Compris'ing a 'crank easing, a cam shaft at a level substantially below the top of the engine, Cams and tappet gear for controlling lthe valves of the engine, a housing surrounding the cam shaft, cam shaft bearings inside the said housing, tappet guides carried by the said housing, and means secured to the side walls of the crank easing for holding the said housing axially and enabling it to be 1e- 'moved as a whole, together with the cam shaft bearings and the tappet guides.

4. An internal `combustion engine comprising a crank easing, a Cam shaft at a level substantially below the ,top of the engine, cams and tappet gear for controlling the valves of the engine, ahousing surrounding the cam shaft, cam shaft bearings inside the said housing, tappet guides earriedby the said housing, and endwise removable supports secured to the side walls of the eranlr casing, thesaid supports being capable of being moved axially with respect to the Cain i shaft to allow the valve gear to be mounted upon or removed from the body of the engine. In testimony whereof I have signed my name to 'this specification, A .t Y

KURT ELTZE. 

